staging: speakup: fix warnings by adding __user annotations

This patch fixes the following sparse warnings by adding
__user annotations.

drivers/staging/speakup/speakup_soft.c:248:34: warning:
        incorrect type in argument 1 (different address spaces)
        drivers/staging/speakup/speakup_soft.c:248:34:
        expected void [noderef] <asn:1>*dst
        drivers/staging/speakup/speakup_soft.c:248:34:
        got char *[assigned] cp
drivers/staging/speakup/speakup_soft.c:272:40: warning:
        incorrect type in argument 1 (different address spaces)
        drivers/staging/speakup/speakup_soft.c:272:40:
        expected char const [noderef] <asn:1>*s
        drivers/staging/speakup/speakup_soft.c:272:40:
        got char const *buf
drivers/staging/speakup/speakup_soft.c:306:17: warning:
        incorrect type in initializer (incompatible argument 2
        (different address spaces))
        drivers/staging/speakup/speakup_soft.c:306:17:
        expected long ( *read )( ... )
        drivers/staging/speakup/speakup_soft.c:306:17:
        got long ( static [toplevel] *<noident> )( ... )
drivers/staging/speakup/speakup_soft.c:307:18: warning:
        incorrect type in initializer (incompatible argument 2
        (different address spaces))
        drivers/staging/speakup/speakup_soft.c:307:18:
        expected long ( *write )( ... )
        drivers/staging/speakup/speakup_soft.c:307:18:
        got long ( static [toplevel] *<nfile_operationsoident> )( ... )

drivers/staging/speakup/devsynth.c:29:41: warning:
        incorrect type in argument 2 (different address spaces)
        drivers/staging/speakup/devsynth.c:29:41:
        expected void const [noderef] <asn:1>*from
        drivers/staging/speakup/devsynth.c:29:41:    got char const *ptr
drivers/staging/speakup/devsynth.c:62:17: warning:
        incorrect type in initializer (incompatible argument 2
        (different address spaces))
        drivers/staging/speakup/devsynth.c:62:17:
        expected long ( *read )( ... )
        drivers/staging/speakup/devsynth.c:62:17:
        got long ( static [toplevel] *<noident> )( ... )
drivers/staging/speakup/devsynth.c:63:18: warning:
        incorrect type in initializer (incompatible argument 2
        (different address spaces))
        drivers/staging/speakup/devsynth.c:63:18:
        expected long ( *write )( ... )
        drivers/staging/speakup/devsynth.c:63:18:
        got long ( static [toplevel] *<noident> )( ... )

Signed-off-by: Emil Goode <emilgoode@gmail.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>